Nirvana as “the unconditioned” mind, a mind that has come to a point of perfect lucidity and clarity due to the absence of volitional formations.
This being is described by the Buddha as “deathlessness” and as the highest spiritual attainment, the natural result that accrues to one who lives a life of virtuous conduct and practise in accordance with the Noble Eightfold Path.
Such a life dissolves the causes for future becoming that otherwise keep beings forever wandering through the impermanent and suffering-generating realms of desire, form, and formlessness, collectively termed samsara.

While nirvana is “unconditioned”, it is not “uncaused” or “independent.”
The stance of the early scriptures is that attaining nibbana depends on effort and is not pre-determined.

This is a picture was shot under the Bodhi Tree which is at Bodh Gaya (बोधगया), in the Indian state of Bihar, the place of Gautama Buddha’s attainment of nirvana (Enlightenment).